Carbon miles calculator works out Total emissions and Per passenger from Mode of travel, Distance and Passengers travelling. The default figures on this page give total emissions of 229.28 kg CO2e; change any entry and the result, the working and the sources update together.
Total emissions
229.28 kg CO2e
Travel Emissions Calculator
Total emissions
0.22928 t CO2e
Per passenger
229.28 kg CO2e
Distance counted
1,000 km
Emission factor applied
0.22928
Factor source
UK DESNZ Government greenhouse gas conversion factors for company reporting 2026, 'Business travel- air', 'Business travel- land' and 'Business travel- sea' categories.
Radiative forcing included
yes
Worked out from US EPA, Greenhouse Gas Emission Factors Hub and 3 other sources.
Uses published average factors for the mode. Actual emissions vary with load factor, routing and aircraft or vehicle type.
Your figures
Updates as you type
How this is worked out
4 steps
Distance 1000 km.
1000 km x 0.22928 kg CO2e per passenger-km = 229.28 kg CO2e per passenger
Total 229.28 kg CO2e (0.2293 tonnes).
This factor includes the radiative-forcing uplift for non-CO2 effects at altitude.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Passenger transport, freight and aviation factors, including the radiative-forcing variants.
IPCC Fifth Assessment Report, 100-year global warming potentials
CH4 and N2O are converted to CO2-equivalent on the AR5 100-year basis used by all three publishers above.
What the carbon miles calculator calculates
Computes the greenhouse gas emissions of a journey by air, road, rail or sea, per passenger or for freight per tonne-kilometre.
How to use this carbon miles calculator
Enter Mode of travel, Distance, Passengers travelling and Return journey. Total emissions updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Total emissions, Per passenger and Distance counted.
The method follows US EPA, Greenhouse Gas Emission Factors Hub, US EPA eGRID, annual total-output emission rates, UK DESNZ, Greenhouse gas reporting: conversion factors and IPCC Fifth Assessment Report, 100-year global warming potentials.
1000 passenger-km of UK domestic flying with radiative forcing example
With Mode of travel: uk_flight_domestic_with_rf, Distance: 1000, Passengers travelling: 1, the calculator returns Total emissions: 229.28. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Total emissions, Per passenger and Distance counted. The inputs you can vary are Mode of travel, Distance, Passengers travelling, Return journey, Freight mode and Freight moved.
Understanding Total emissions, Per passenger and Distance counted
Uses published average factors for the mode. Actual emissions vary with load factor, routing and aircraft or vehicle type.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
Embed this calculator on your website
Copy this code into any page. The calculator appears with the figures currently entered, sizes itself to fit, and a small credit line links back here. Free, no account, no ads inside it, no tracking of your readers. Set your own figures and fixed fields; Personal removes the credit line, sets your colour and shows you which sites use it.
On the figures this page opens with — distance 1,000 km — the total emissions is 229.28 kg CO2e. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
Is there a carbon footprint calculator?
Computes the greenhouse gas emissions of a journey by air, road, rail or sea, per passenger or for freight per tonne-kilometre. On the figures this page opens with — distance 1,000 km — the total emissions is 229.28 kg CO2e. Put your own figures in their place and the working updates beside the result.
How do I calculate my carbon footprint?
Computes the greenhouse gas emissions of a journey by air, road, rail or sea, per passenger or for freight per tonne-kilometre. Open “How this is worked out” beside the result to see each step for your own figures.
What's a good carbon footprint score?
Computes the greenhouse gas emissions of a journey by air, road, rail or sea, per passenger or for freight per tonne-kilometre. On this page it is computed from Mode of travel, Distance and Passengers travelling and shown as Total emissions, Per passenger and Distance counted.
What information do I need for the carbon miles calculator?
You need Mode of travel, Distance, Passengers travelling, Return journey, Freight mode, Freight moved and Offset price. The page opens with default figures that give total emissions of 229.28 kg CO2e, so you can see the scale before entering your own.
What does this carbon miles calculator show?
It shows Total emissions, Per passenger, Distance counted, Emission factor applied, Factor source, Radiative forcing included and Cost to offset, with the working and any warnings for your entries.
